function getXmlHttp() {
		var xmlhttp;
		try {
	    	xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	  	} catch (e) {
	    	try {
	      		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	    	} catch (E) {
	      		xmlhttp = false;
	    	}
	  	}
	  	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	    	xmlhttp = new XMLHttpRequest();
	  	}
	  	return xmlhttp;
	}